Title:
OPTICAL DISK, PRODUCTION OF OPTICAL DISK AND APPARATUS FOR PRODUCTION OF OPTICAL DISK
Document Type and Number:
Japanese Patent JP3175677
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk having a αwatermarkβ which is visible from a disk reproducing surface side and cannot be duplicated.
SOLUTION: In the process for producing the optical disk A of a bonding type formed by sequentially laminating a reflection layer 2, an adhesive layer 3 and a dummy transparent substrate 4 on the signal recording surface 1a of the transparent substrate 1, the adhesive layer 3 consists of an adhesive of which the curing rate changes according to the irradiation quantity of UV rays and a light shielding mask 15 which forms the αwatermarkβ is arranged on the surface 4a side of the substrate 4. The inside of the adhesive layer 3 is irradiated with the UV rays while the irradiation quantity thereof is changed according to a state of the light shielding part agent of the light shielding 15 via the mask 15, by which the recording in the optical disk A is executed.
Inventors:
Akira Nishizawa
Application Number:
JP34432097A
Publication Date:
June 11, 2001
Filing Date:
November 28, 1997
Export Citation:
Assignee:
Victor Company of Japan Ltd.
International Classes:
G11B7/26; G11B7/24024; G11B7/24027; G11B7/24094; G11B7/24097; (IPC1-7): G11B7/26
Domestic Patent References:
| JP9306033A |